1
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4
5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/slab.h>
10#include <linux/err.h>
11#include <linux/nvme-tcp.h>
12#include <net/sock.h>
13#include <net/tcp.h>
14#include <linux/inet.h>
15#include <linux/llist.h>
16#include <crypto/hash.h>
17
18#include "nvmet.h"
19
20#define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE)
21
22
23
24
25
26
27
28static int so_priority;
29module_param(so_priority, int, 0644);
30MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority");
31
32#define NVMET_TCP_RECV_BUDGET 8
33#define NVMET_TCP_SEND_BUDGET 8
34#define NVMET_TCP_IO_WORK_BUDGET 64
35
36enum nvmet_tcp_send_state {
37 NVMET_TCP_SEND_DATA_PDU,
38 NVMET_TCP_SEND_DATA,
39 NVMET_TCP_SEND_R2T,
40 NVMET_TCP_SEND_DDGST,
41 NVMET_TCP_SEND_RESPONSE
42};
43
44enum nvmet_tcp_recv_state {
45 NVMET_TCP_RECV_PDU,
46 NVMET_TCP_RECV_DATA,
47 NVMET_TCP_RECV_DDGST,
48 NVMET_TCP_RECV_ERR,
49};
50
51enum {
52 NVMET_TCP_F_INIT_FAILED = (1 << 0),
53};
54
55struct nvmet_tcp_cmd {
56 struct nvmet_tcp_queue *queue;
57 struct nvmet_req req;
58
59 struct nvme_tcp_cmd_pdu *cmd_pdu;
60 struct nvme_tcp_rsp_pdu *rsp_pdu;
61 struct nvme_tcp_data_pdu *data_pdu;
62 struct nvme_tcp_r2t_pdu *r2t_pdu;
63
64 u32 rbytes_done;
65 u32 wbytes_done;
66
67 u32 pdu_len;
68 u32 pdu_recv;
69 int sg_idx;
70 int nr_mapped;
71 struct msghdr recv_msg;
72 struct kvec *iov;
73 u32 flags;
74
75 struct list_head entry;
76 struct llist_node lentry;
77
78
79 u32 offset;
80 struct scatterlist *cur_sg;
81 enum nvmet_tcp_send_state state;
82
83 __le32 exp_ddgst;
84 __le32 recv_ddgst;
85};
86
87enum nvmet_tcp_queue_state {
88 NVMET_TCP_Q_CONNECTING,
89 NVMET_TCP_Q_LIVE,
90 NVMET_TCP_Q_DISCONNECTING,
91};
92
93struct nvmet_tcp_queue {
94 struct socket *sock;
95 struct nvmet_tcp_port *port;
96 struct work_struct io_work;
97 int cpu;
98 struct nvmet_cq nvme_cq;
99 struct nvmet_sq nvme_sq;
100
101
102 struct nvmet_tcp_cmd *cmds;
103 unsigned int nr_cmds;
104 struct list_head free_list;
105 struct llist_head resp_list;
106 struct list_head resp_send_list;
107 int send_list_len;
108 struct nvmet_tcp_cmd *snd_cmd;
109
110
111 int offset;
112 int left;
113 enum nvmet_tcp_recv_state rcv_state;
114 struct nvmet_tcp_cmd *cmd;
115 union nvme_tcp_pdu pdu;
116
117
118 bool hdr_digest;
119 bool data_digest;
120 struct ahash_request *snd_hash;
121 struct ahash_request *rcv_hash;
122
123 spinlock_t state_lock;
124 enum nvmet_tcp_queue_state state;
125
126 struct sockaddr_storage sockaddr;
127 struct sockaddr_storage sockaddr_peer;
128 struct work_struct release_work;
129
130 int idx;
131 struct list_head queue_list;
132
133 struct nvmet_tcp_cmd connect;
134
135 struct page_frag_cache pf_cache;
136
137 void (*data_ready)(struct sock *);
138 void (*state_change)(struct sock *);
139 void (*write_space)(struct sock *);
140};
141
142struct nvmet_tcp_port {
143 struct socket *sock;
144 struct work_struct accept_work;
145 struct nvmet_port *nport;
146 struct sockaddr_storage addr;
147 int last_cpu;
148 void (*data_ready)(struct sock *);
149};
150
151static DEFINE_IDA(nvmet_tcp_queue_ida);
152static LIST_HEAD(nvmet_tcp_queue_list);
153static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
154
155static struct workqueue_struct *nvmet_tcp_wq;
156static const struct nvmet_fabrics_ops nvmet_tcp_ops;
157static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
158static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd);
159
160static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue,
161 struct nvmet_tcp_cmd *cmd)
162{
163 if (unlikely(!queue->nr_cmds)) {
164
165 return USHRT_MAX;
166 }
167
168 return cmd - queue->cmds;
169}
170
171static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd)
172{
173 return nvme_is_write(cmd->req.cmd) &&
174 cmd->rbytes_done < cmd->req.transfer_len;
175}
176
177static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
178{
179 return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
180}
181
182static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd)
183{
184 return !nvme_is_write(cmd->req.cmd) &&
185 cmd->req.transfer_len > 0 &&
186 !cmd->req.cqe->status;
187}
188
189static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd)
190{
191 return nvme_is_write(cmd->req.cmd) && cmd->pdu_len &&
192 !cmd->rbytes_done;
193}
194
195static inline struct nvmet_tcp_cmd *
196nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue)
197{
198 struct nvmet_tcp_cmd *cmd;
199
200 cmd = list_first_entry_or_null(&queue->free_list,
201 struct nvmet_tcp_cmd, entry);
202 if (!cmd)
203 return NULL;
204 list_del_init(&cmd->entry);
205
206 cmd->rbytes_done = cmd->wbytes_done = 0;
207 cmd->pdu_len = 0;
208 cmd->pdu_recv = 0;
209 cmd->iov = NULL;
210 cmd->flags = 0;
211 return cmd;
212}
213
214static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd)
215{
216 if (unlikely(cmd == &cmd->queue->connect))
217 return;
218
219 list_add_tail(&cmd->entry, &cmd->queue->free_list);
220}
221
222static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
223{
224 return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
225}
226
227static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
228{
229 return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
230}
231
232static inline void nvmet_tcp_hdgst(struct ahash_request *hash,
233 void *pdu, size_t len)
234{
235 struct scatterlist sg;
236
237 sg_init_one(&sg, pdu, len);
238 ahash_request_set_crypt(hash, &sg, pdu + len, len);
239 crypto_ahash_digest(hash);
240}
241
242static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue,
243 void *pdu, size_t len)
244{
245 struct nvme_tcp_hdr *hdr = pdu;
246 __le32 recv_digest;
247 __le32 exp_digest;
248
249 if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
250 pr_err("queue %d: header digest enabled but no header digest\n",
251 queue->idx);
252 return -EPROTO;
253 }
254
255 recv_digest = *(__le32 *)(pdu + hdr->hlen);
256 nvmet_tcp_hdgst(queue->rcv_hash, pdu, len);
257 exp_digest = *(__le32 *)(pdu + hdr->hlen);
258 if (recv_digest != exp_digest) {
259 pr_err("queue %d: header digest error: recv %#x expected %#x\n",
260 queue->idx, le32_to_cpu(recv_digest),
261 le32_to_cpu(exp_digest));
262 return -EPROTO;
263 }
264
265 return 0;
266}
267
268static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu)
269{
270 struct nvme_tcp_hdr *hdr = pdu;
271 u8 digest_len = nvmet_tcp_hdgst_len(queue);
272 u32 len;
273
274 len = le32_to_cpu(hdr->plen) - hdr->hlen -
275 (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0);
276
277 if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
278 pr_err("queue %d: data digest flag is cleared\n", queue->idx);
279 return -EPROTO;
280 }
281
282 return 0;
283}
284
285static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd)
286{
287 struct scatterlist *sg;
288 int i;
289
290 sg = &cmd->req.sg[cmd->sg_idx];
291
292 for (i = 0; i < cmd->nr_mapped; i++)
293 kunmap(sg_page(&sg[i]));
294}
295
296static void nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd *cmd)
297{
298 struct kvec *iov = cmd->iov;
299 struct scatterlist *sg;
300 u32 length, offset, sg_offset;
301
302 length = cmd->pdu_len;
303 cmd->nr_mapped = DIV_ROUND_UP(length, PAGE_SIZE);
304 offset = cmd->rbytes_done;
305 cmd->sg_idx = DIV_ROUND_UP(offset, PAGE_SIZE);
306 sg_offset = offset % PAGE_SIZE;
307 sg = &cmd->req.sg[cmd->sg_idx];
308
309 while (length) {
310 u32 iov_len = min_t(u32, length, sg->length - sg_offset);
311
312 iov->iov_base = kmap(sg_page(sg)) + sg->offset + sg_offset;
313 iov->iov_len = iov_len;
314
315 length -= iov_len;
316 sg = sg_next(sg);
317 iov++;
318 }
319
320 iov_iter_kvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
321 cmd->nr_mapped, cmd->pdu_len);
322}
323
324static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
325{
326 queue->rcv_state = NVMET_TCP_RECV_ERR;
327 if (queue->nvme_sq.ctrl)
328 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
329 else
330 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
331}
332
333static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status)
334{
335 if (status == -EPIPE || status == -ECONNRESET)
336 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
337 else
338 nvmet_tcp_fatal_error(queue);
339}
340
341static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
342{
343 struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
344 u32 len = le32_to_cpu(sgl->length);
345
346 if (!len)
347 return 0;
348
349 if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) |
350 NVME_SGL_FMT_OFFSET)) {
351 if (!nvme_is_write(cmd->req.cmd))
352 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
353
354 if (len > cmd->req.port->inline_data_size)
355 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
356 cmd->pdu_len = len;
357 }
358 cmd->req.transfer_len += len;
359
360 cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);
361 if (!cmd->req.sg)
362 return NVME_SC_INTERNAL;
363 cmd->cur_sg = cmd->req.sg;
364
365 if (nvmet_tcp_has_data_in(cmd)) {
366 cmd->iov = kmalloc_array(cmd->req.sg_cnt,
367 sizeof(*cmd->iov), GFP_KERNEL);
368 if (!cmd->iov)
369 goto err;
370 }
371
372 return 0;
373err:
374 sgl_free(cmd->req.sg);
375 return NVME_SC_INTERNAL;
376}
377
378static void nvmet_tcp_ddgst(struct ahash_request *hash,
379 struct nvmet_tcp_cmd *cmd)
380{
381 ahash_request_set_crypt(hash, cmd->req.sg,
382 (void *)&cmd->exp_ddgst, cmd->req.transfer_len);
383 crypto_ahash_digest(hash);
384}
385
386static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd)
387{
388 struct nvme_tcp_data_pdu *pdu = cmd->data_pdu;
389 struct nvmet_tcp_queue *queue = cmd->queue;
390 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
391 u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue);
392
393 cmd->offset = 0;
394 cmd->state = NVMET_TCP_SEND_DATA_PDU;
395
396 pdu->hdr.type = nvme_tcp_c2h_data;
397 pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
398 NVME_TCP_F_DATA_SUCCESS : 0);
399 pdu->hdr.hlen = sizeof(*pdu);
400 pdu->hdr.pdo = pdu->hdr.hlen + hdgst;
401 pdu->hdr.plen =
402 cpu_to_le32(pdu->hdr.hlen + hdgst +
403 cmd->req.transfer_len + ddgst);
404 pdu->command_id = cmd->req.cqe->command_id;
405 pdu->data_length = cpu_to_le32(cmd->req.transfer_len);
406 pdu->data_offset = cpu_to_le32(cmd->wbytes_done);
407
408 if (queue->data_digest) {
409 pdu->hdr.flags |= NVME_TCP_F_DDGST;
410 nvmet_tcp_ddgst(queue->snd_hash, cmd);
411 }
412
413 if (cmd->queue->hdr_digest) {
414 pdu->hdr.flags |= NVME_TCP_F_HDGST;
415 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
416 }
417}
418
419static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd)
420{
421 struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu;
422 struct nvmet_tcp_queue *queue = cmd->queue;
423 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
424
425 cmd->offset = 0;
426 cmd->state = NVMET_TCP_SEND_R2T;
427
428 pdu->hdr.type = nvme_tcp_r2t;
429 pdu->hdr.flags = 0;
430 pdu->hdr.hlen = sizeof(*pdu);
431 pdu->hdr.pdo = 0;
432 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
433
434 pdu->command_id = cmd->req.cmd->common.command_id;
435 pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd);
436 pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done);
437 pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done);
438 if (cmd->queue->hdr_digest) {
439 pdu->hdr.flags |= NVME_TCP_F_HDGST;
440 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
441 }
442}
443
444static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd)
445{
446 struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu;
447 struct nvmet_tcp_queue *queue = cmd->queue;
448 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
449
450 cmd->offset = 0;
451 cmd->state = NVMET_TCP_SEND_RESPONSE;
452
453 pdu->hdr.type = nvme_tcp_rsp;
454 pdu->hdr.flags = 0;
455 pdu->hdr.hlen = sizeof(*pdu);
456 pdu->hdr.pdo = 0;
457 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
458 if (cmd->queue->hdr_digest) {
459 pdu->hdr.flags |= NVME_TCP_F_HDGST;
460 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
461 }
462}
463
464static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue)
465{
466 struct llist_node *node;
467 struct nvmet_tcp_cmd *cmd;
468
469 for (node = llist_del_all(&queue->resp_list); node; node = node->next) {
470 cmd = llist_entry(node, struct nvmet_tcp_cmd, lentry);
471 list_add(&cmd->entry, &queue->resp_send_list);
472 queue->send_list_len++;
473 }
474}
475
476static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue)
477{
478 queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list,
479 struct nvmet_tcp_cmd, entry);
480 if (!queue->snd_cmd) {
481 nvmet_tcp_process_resp_list(queue);
482 queue->snd_cmd =
483 list_first_entry_or_null(&queue->resp_send_list,
484 struct nvmet_tcp_cmd, entry);
485 if (unlikely(!queue->snd_cmd))
486 return NULL;
487 }
488
489 list_del_init(&queue->snd_cmd->entry);
490 queue->send_list_len--;
491
492 if (nvmet_tcp_need_data_out(queue->snd_cmd))
493 nvmet_setup_c2h_data_pdu(queue->snd_cmd);
494 else if (nvmet_tcp_need_data_in(queue->snd_cmd))
495 nvmet_setup_r2t_pdu(queue->snd_cmd);
496 else
497 nvmet_setup_response_pdu(queue->snd_cmd);
498
499 return queue->snd_cmd;
500}
501
502static void nvmet_tcp_queue_response(struct nvmet_req *req)
503{
504 struct nvmet_tcp_cmd *cmd =
505 container_of(req, struct nvmet_tcp_cmd, req);
506 struct nvmet_tcp_queue *queue = cmd->queue;
507
508 llist_add(&cmd->lentry, &queue->resp_list);
509 queue_work_on(cmd->queue->cpu, nvmet_tcp_wq, &cmd->queue->io_work);
510}
511
512static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd)
513{
514 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
515 int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst;
516 int ret;
517
518 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->data_pdu),
519 offset_in_page(cmd->data_pdu) + cmd->offset,
520 left, MSG_DONTWAIT | MSG_MORE | MSG_SENDPAGE_NOTLAST);
521 if (ret <= 0)
522 return ret;
523
524 cmd->offset += ret;
525 left -= ret;
526
527 if (left)
528 return -EAGAIN;
529
530 cmd->state = NVMET_TCP_SEND_DATA;
531 cmd->offset = 0;
532 return 1;
533}
534
535static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
536{
537 struct nvmet_tcp_queue *queue = cmd->queue;
538 int ret;
539
540 while (cmd->cur_sg) {
541 struct page *page = sg_page(cmd->cur_sg);
542 u32 left = cmd->cur_sg->length - cmd->offset;
543 int flags = MSG_DONTWAIT;
544
545 if ((!last_in_batch && cmd->queue->send_list_len) ||
546 cmd->wbytes_done + left < cmd->req.transfer_len ||
547 queue->data_digest || !queue->nvme_sq.sqhd_disabled)
548 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
549
550 ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset,
551 left, flags);
552 if (ret <= 0)
553 return ret;
554
555 cmd->offset += ret;
556 cmd->wbytes_done += ret;
557
558
559 if (cmd->offset == cmd->cur_sg->length) {
560 cmd->cur_sg = sg_next(cmd->cur_sg);
561 cmd->offset = 0;
562 }
563 }
564
565 if (queue->data_digest) {
566 cmd->state = NVMET_TCP_SEND_DDGST;
567 cmd->offset = 0;
568 } else {
569 if (queue->nvme_sq.sqhd_disabled) {
570 cmd->queue->snd_cmd = NULL;
571 nvmet_tcp_put_cmd(cmd);
572 } else {
573 nvmet_setup_response_pdu(cmd);
574 }
575 }
576
577 if (queue->nvme_sq.sqhd_disabled) {
578 kfree(cmd->iov);
579 sgl_free(cmd->req.sg);
580 }
581
582 return 1;
583
584}
585
586static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
587 bool last_in_batch)
588{
589 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
590 int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst;
591 int flags = MSG_DONTWAIT;
592 int ret;
593
594 if (!last_in_batch && cmd->queue->send_list_len)
595 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
596 else
597 flags |= MSG_EOR;
598
599 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->rsp_pdu),
600 offset_in_page(cmd->rsp_pdu) + cmd->offset, left, flags);
601 if (ret <= 0)
602 return ret;
603 cmd->offset += ret;
604 left -= ret;
605
606 if (left)
607 return -EAGAIN;
608
609 kfree(cmd->iov);
610 sgl_free(cmd->req.sg);
611 cmd->queue->snd_cmd = NULL;
612 nvmet_tcp_put_cmd(cmd);
613 return 1;
614}
615
616static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
617{
618 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
619 int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst;
620 int flags = MSG_DONTWAIT;
621 int ret;
622
623 if (!last_in_batch && cmd->queue->send_list_len)
624 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
625 else
626 flags |= MSG_EOR;
627
628 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->r2t_pdu),
629 offset_in_page(cmd->r2t_pdu) + cmd->offset, left, flags);
630 if (ret <= 0)
631 return ret;
632 cmd->offset += ret;
633 left -= ret;
634
635 if (left)
636 return -EAGAIN;
637
638 cmd->queue->snd_cmd = NULL;
639 return 1;
640}
641
642static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
643{
644 struct nvmet_tcp_queue *queue = cmd->queue;
645 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
646 struct kvec iov = {
647 .iov_base = &cmd->exp_ddgst + cmd->offset,
648 .iov_len = NVME_TCP_DIGEST_LENGTH - cmd->offset
649 };
650 int ret;
651
652 if (!last_in_batch && cmd->queue->send_list_len)
653 msg.msg_flags |= MSG_MORE;
654 else
655 msg.msg_flags |= MSG_EOR;
656
657 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
658 if (unlikely(ret <= 0))
659 return ret;
660
661 cmd->offset += ret;
662
663 if (queue->nvme_sq.sqhd_disabled) {
664 cmd->queue->snd_cmd = NULL;
665 nvmet_tcp_put_cmd(cmd);
666 } else {
667 nvmet_setup_response_pdu(cmd);
668 }
669 return 1;
670}
671
672static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue,
673 bool last_in_batch)
674{
675 struct nvmet_tcp_cmd *cmd = queue->snd_cmd;
676 int ret = 0;
677
678 if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) {
679 cmd = nvmet_tcp_fetch_cmd(queue);
680 if (unlikely(!cmd))
681 return 0;
682 }
683
684 if (cmd->state == NVMET_TCP_SEND_DATA_PDU) {
685 ret = nvmet_try_send_data_pdu(cmd);
686 if (ret <= 0)
687 goto done_send;
688 }
689
690 if (cmd->state == NVMET_TCP_SEND_DATA) {
691 ret = nvmet_try_send_data(cmd, last_in_batch);
692 if (ret <= 0)
693 goto done_send;
694 }
695
696 if (cmd->state == NVMET_TCP_SEND_DDGST) {
697 ret = nvmet_try_send_ddgst(cmd, last_in_batch);
698 if (ret <= 0)
699 goto done_send;
700 }
701
702 if (cmd->state == NVMET_TCP_SEND_R2T) {
703 ret = nvmet_try_send_r2t(cmd, last_in_batch);
704 if (ret <= 0)
705 goto done_send;
706 }
707
708 if (cmd->state == NVMET_TCP_SEND_RESPONSE)
709 ret = nvmet_try_send_response(cmd, last_in_batch);
710
711done_send:
712 if (ret < 0) {
713 if (ret == -EAGAIN)
714 return 0;
715 return ret;
716 }
717
718 return 1;
719}
720
721static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue,
722 int budget, int *sends)
723{
724 int i, ret = 0;
725
726 for (i = 0; i < budget; i++) {
727 ret = nvmet_tcp_try_send_one(queue, i == budget - 1);
728 if (unlikely(ret < 0)) {
729 nvmet_tcp_socket_error(queue, ret);
730 goto done;
731 } else if (ret == 0) {
732 break;
733 }
734 (*sends)++;
735 }
736done:
737 return ret;
738}
739
740static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue)
741{
742 queue->offset = 0;
743 queue->left = sizeof(struct nvme_tcp_hdr);
744 queue->cmd = NULL;
745 queue->rcv_state = NVMET_TCP_RECV_PDU;
746}
747
748static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue)
749{
750 struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash);
751
752 ahash_request_free(queue->rcv_hash);
753 ahash_request_free(queue->snd_hash);
754 crypto_free_ahash(tfm);
755}
756
757static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue)
758{
759 struct crypto_ahash *tfm;
760
761 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
762 if (IS_ERR(tfm))
763 return PTR_ERR(tfm);
764
765 queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL);
766 if (!queue->snd_hash)
767 goto free_tfm;
768 ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL);
769
770 queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL);
771 if (!queue->rcv_hash)
772 goto free_snd_hash;
773 ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL);
774
775 return 0;
776free_snd_hash:
777 ahash_request_free(queue->snd_hash);
778free_tfm:
779 crypto_free_ahash(tfm);
780 return -ENOMEM;
781}
782
783
784static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue)
785{
786 struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq;
787 struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp;
788 struct msghdr msg = {};
789 struct kvec iov;
790 int ret;
791
792 if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) {
793 pr_err("bad nvme-tcp pdu length (%d)\n",
794 le32_to_cpu(icreq->hdr.plen));
795 nvmet_tcp_fatal_error(queue);
796 }
797
798 if (icreq->pfv != NVME_TCP_PFV_1_0) {
799 pr_err("queue %d: bad pfv %d\n", queue->idx, icreq->pfv);
800 return -EPROTO;
801 }
802
803 if (icreq->hpda != 0) {
804 pr_err("queue %d: unsupported hpda %d\n", queue->idx,
805 icreq->hpda);
806 return -EPROTO;
807 }
808
809 queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE);
810 queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE);
811 if (queue->hdr_digest || queue->data_digest) {
812 ret = nvmet_tcp_alloc_crypto(queue);
813 if (ret)
814 return ret;
815 }
816
817 memset(icresp, 0, sizeof(*icresp));
818 icresp->hdr.type = nvme_tcp_icresp;
819 icresp->hdr.hlen = sizeof(*icresp);
820 icresp->hdr.pdo = 0;
821 icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen);
822 icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
823 icresp->maxdata = cpu_to_le32(0x400000);
824 icresp->cpda = 0;
825 if (queue->hdr_digest)
826 icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
827 if (queue->data_digest)
828 icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE;
829
830 iov.iov_base = icresp;
831 iov.iov_len = sizeof(*icresp);
832 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
833 if (ret < 0)
834 goto free_crypto;
835
836 queue->state = NVMET_TCP_Q_LIVE;
837 nvmet_prepare_receive_pdu(queue);
838 return 0;
839free_crypto:
840 if (queue->hdr_digest || queue->data_digest)
841 nvmet_tcp_free_crypto(queue);
842 return ret;
843}
844
845static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue,
846 struct nvmet_tcp_cmd *cmd, struct nvmet_req *req)
847{
848 size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
849 int ret;
850
851 if (!nvme_is_write(cmd->req.cmd) ||
852 data_len > cmd->req.port->inline_data_size) {
853 nvmet_prepare_receive_pdu(queue);
854 return;
855 }
856
857 ret = nvmet_tcp_map_data(cmd);
858 if (unlikely(ret)) {
859 pr_err("queue %d: failed to map data\n", queue->idx);
860 nvmet_tcp_fatal_error(queue);
861 return;
862 }
863
864 queue->rcv_state = NVMET_TCP_RECV_DATA;
865 nvmet_tcp_map_pdu_iovec(cmd);
866 cmd->flags |= NVMET_TCP_F_INIT_FAILED;
867}
868
869static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
870{
871 struct nvme_tcp_data_pdu *data = &queue->pdu.data;
872 struct nvmet_tcp_cmd *cmd;
873
874 if (likely(queue->nr_cmds))
875 cmd = &queue->cmds[data->ttag];
876 else
877 cmd = &queue->connect;
878
879 if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) {
880 pr_err("ttag %u unexpected data offset %u (expected %u)\n",
881 data->ttag, le32_to_cpu(data->data_offset),
882 cmd->rbytes_done);
883
884 nvmet_req_complete(&cmd->req,
885 NVME_SC_INVALID_FIELD | NVME_SC_DNR);
886 return -EPROTO;
887 }
888
889 cmd->pdu_len = le32_to_cpu(data->data_length);
890 cmd->pdu_recv = 0;
891 nvmet_tcp_map_pdu_iovec(cmd);
892 queue->cmd = cmd;
893 queue->rcv_state = NVMET_TCP_RECV_DATA;
894
895 return 0;
896}
897
898static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue)
899{
900 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
901 struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd;
902 struct nvmet_req *req;
903 int ret;
904
905 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
906 if (hdr->type != nvme_tcp_icreq) {
907 pr_err("unexpected pdu type (%d) before icreq\n",
908 hdr->type);
909 nvmet_tcp_fatal_error(queue);
910 return -EPROTO;
911 }
912 return nvmet_tcp_handle_icreq(queue);
913 }
914
915 if (hdr->type == nvme_tcp_h2c_data) {
916 ret = nvmet_tcp_handle_h2c_data_pdu(queue);
917 if (unlikely(ret))
918 return ret;
919 return 0;
920 }
921
922 queue->cmd = nvmet_tcp_get_cmd(queue);
923 if (unlikely(!queue->cmd)) {
924
925 pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d",
926 queue->idx, queue->nr_cmds, queue->send_list_len,
927 nvme_cmd->common.opcode);
928 nvmet_tcp_fatal_error(queue);
929 return -ENOMEM;
930 }
931
932 req = &queue->cmd->req;
933 memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd));
934
935 if (unlikely(!nvmet_req_init(req, &queue->nvme_cq,
936 &queue->nvme_sq, &nvmet_tcp_ops))) {
937 pr_err("failed cmd %p id %d opcode %d, data_len: %d\n",
938 req->cmd, req->cmd->common.command_id,
939 req->cmd->common.opcode,
940 le32_to_cpu(req->cmd->common.dptr.sgl.length));
941
942 nvmet_tcp_handle_req_failure(queue, queue->cmd, req);
943 return -EAGAIN;
944 }
945
946 ret = nvmet_tcp_map_data(queue->cmd);
947 if (unlikely(ret)) {
948 pr_err("queue %d: failed to map data\n", queue->idx);
949 if (nvmet_tcp_has_inline_data(queue->cmd))
950 nvmet_tcp_fatal_error(queue);
951 else
952 nvmet_req_complete(req, ret);
953 ret = -EAGAIN;
954 goto out;
955 }
956
957 if (nvmet_tcp_need_data_in(queue->cmd)) {
958 if (nvmet_tcp_has_inline_data(queue->cmd)) {
959 queue->rcv_state = NVMET_TCP_RECV_DATA;
960 nvmet_tcp_map_pdu_iovec(queue->cmd);
961 return 0;
962 }
963
964 nvmet_tcp_queue_response(&queue->cmd->req);
965 goto out;
966 }
967
968 queue->cmd->req.execute(&queue->cmd->req);
969out:
970 nvmet_prepare_receive_pdu(queue);
971 return ret;
972}
973
974static const u8 nvme_tcp_pdu_sizes[] = {
975 [nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu),
976 [nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu),
977 [nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu),
978};
979
980static inline u8 nvmet_tcp_pdu_size(u8 type)
981{
982 size_t idx = type;
983
984 return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) &&
985 nvme_tcp_pdu_sizes[idx]) ?
986 nvme_tcp_pdu_sizes[idx] : 0;
987}
988
989static inline bool nvmet_tcp_pdu_valid(u8 type)
990{
991 switch (type) {
992 case nvme_tcp_icreq:
993 case nvme_tcp_cmd:
994 case nvme_tcp_h2c_data:
995
996 return true;
997 }
998
999 return false;
1000}
1001
1002static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue)
1003{
1004 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
1005 int len;
1006 struct kvec iov;
1007 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1008
1009recv:
1010 iov.iov_base = (void *)&queue->pdu + queue->offset;
1011 iov.iov_len = queue->left;
1012 len = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1013 iov.iov_len, msg.msg_flags);
1014 if (unlikely(len < 0))
1015 return len;
1016
1017 queue->offset += len;
1018 queue->left -= len;
1019 if (queue->left)
1020 return -EAGAIN;
1021
1022 if (queue->offset == sizeof(struct nvme_tcp_hdr)) {
1023 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1024
1025 if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) {
1026 pr_err("unexpected pdu type %d\n", hdr->type);
1027 nvmet_tcp_fatal_error(queue);
1028 return -EIO;
1029 }
1030
1031 if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) {
1032 pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen);
1033 return -EIO;
1034 }
1035
1036 queue->left = hdr->hlen - queue->offset + hdgst;
1037 goto recv;
1038 }
1039
1040 if (queue->hdr_digest &&
1041 nvmet_tcp_verify_hdgst(queue, &queue->pdu, queue->offset)) {
1042 nvmet_tcp_fatal_error(queue);
1043 return -EPROTO;
1044 }
1045
1046 if (queue->data_digest &&
1047 nvmet_tcp_check_ddgst(queue, &queue->pdu)) {
1048 nvmet_tcp_fatal_error(queue);
1049 return -EPROTO;
1050 }
1051
1052 return nvmet_tcp_done_recv_pdu(queue);
1053}
1054
1055static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd)
1056{
1057 struct nvmet_tcp_queue *queue = cmd->queue;
1058
1059 nvmet_tcp_ddgst(queue->rcv_hash, cmd);
1060 queue->offset = 0;
1061 queue->left = NVME_TCP_DIGEST_LENGTH;
1062 queue->rcv_state = NVMET_TCP_RECV_DDGST;
1063}
1064
1065static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue)
1066{
1067 struct nvmet_tcp_cmd *cmd = queue->cmd;
1068 int ret;
1069
1070 while (msg_data_left(&cmd->recv_msg)) {
1071 ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg,
1072 cmd->recv_msg.msg_flags);
1073 if (ret <= 0)
1074 return ret;
1075
1076 cmd->pdu_recv += ret;
1077 cmd->rbytes_done += ret;
1078 }
1079
1080 nvmet_tcp_unmap_pdu_iovec(cmd);
1081
1082 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1083 cmd->rbytes_done == cmd->req.transfer_len) {
1084 if (queue->data_digest) {
1085 nvmet_tcp_prep_recv_ddgst(cmd);
1086 return 0;
1087 }
1088 cmd->req.execute(&cmd->req);
1089 }
1090
1091 nvmet_prepare_receive_pdu(queue);
1092 return 0;
1093}
1094
1095static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue)
1096{
1097 struct nvmet_tcp_cmd *cmd = queue->cmd;
1098 int ret;
1099 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1100 struct kvec iov = {
1101 .iov_base = (void *)&cmd->recv_ddgst + queue->offset,
1102 .iov_len = queue->left
1103 };
1104
1105 ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1106 iov.iov_len, msg.msg_flags);
1107 if (unlikely(ret < 0))
1108 return ret;
1109
1110 queue->offset += ret;
1111 queue->left -= ret;
1112 if (queue->left)
1113 return -EAGAIN;
1114
1115 if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) {
1116 pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n",
1117 queue->idx, cmd->req.cmd->common.command_id,
1118 queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst),
1119 le32_to_cpu(cmd->exp_ddgst));
1120 nvmet_tcp_finish_cmd(cmd);
1121 nvmet_tcp_fatal_error(queue);
1122 ret = -EPROTO;
1123 goto out;
1124 }
1125
1126 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1127 cmd->rbytes_done == cmd->req.transfer_len)
1128 cmd->req.execute(&cmd->req);
1129 ret = 0;
1130out:
1131 nvmet_prepare_receive_pdu(queue);
1132 return ret;
1133}
1134
1135static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue)
1136{
1137 int result = 0;
1138
1139 if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR))
1140 return 0;
1141
1142 if (queue->rcv_state == NVMET_TCP_RECV_PDU) {
1143 result = nvmet_tcp_try_recv_pdu(queue);
1144 if (result != 0)
1145 goto done_recv;
1146 }
1147
1148 if (queue->rcv_state == NVMET_TCP_RECV_DATA) {
1149 result = nvmet_tcp_try_recv_data(queue);
1150 if (result != 0)
1151 goto done_recv;
1152 }
1153
1154 if (queue->rcv_state == NVMET_TCP_RECV_DDGST) {
1155 result = nvmet_tcp_try_recv_ddgst(queue);
1156 if (result != 0)
1157 goto done_recv;
1158 }
1159
1160done_recv:
1161 if (result < 0) {
1162 if (result == -EAGAIN)
1163 return 0;
1164 return result;
1165 }
1166 return 1;
1167}
1168
1169static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
1170 int budget, int *recvs)
1171{
1172 int i, ret = 0;
1173
1174 for (i = 0; i < budget; i++) {
1175 ret = nvmet_tcp_try_recv_one(queue);
1176 if (unlikely(ret < 0)) {
1177 nvmet_tcp_socket_error(queue, ret);
1178 goto done;
1179 } else if (ret == 0) {
1180 break;
1181 }
1182 (*recvs)++;
1183 }
1184done:
1185 return ret;
1186}
1187
1188static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
1189{
1190 spin_lock(&queue->state_lock);
1191 if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
1192 queue->state = NVMET_TCP_Q_DISCONNECTING;
1193 schedule_work(&queue->release_work);
1194 }
1195 spin_unlock(&queue->state_lock);
1196}
1197
1198static void nvmet_tcp_io_work(struct work_struct *w)
1199{
1200 struct nvmet_tcp_queue *queue =
1201 container_of(w, struct nvmet_tcp_queue, io_work);
1202 bool pending;
1203 int ret, ops = 0;
1204
1205 do {
1206 pending = false;
1207
1208 ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
1209 if (ret > 0)
1210 pending = true;
1211 else if (ret < 0)
1212 return;
1213
1214 ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
1215 if (ret > 0)
1216 pending = true;
1217 else if (ret < 0)
1218 return;
1219
1220 } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
1221
1222
1223
1224
1225 if (pending)
1226 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1227}
1228
1229static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue,
1230 struct nvmet_tcp_cmd *c)
1231{
1232 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1233
1234 c->queue = queue;
1235 c->req.port = queue->port->nport;
1236
1237 c->cmd_pdu = page_frag_alloc(&queue->pf_cache,
1238 sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1239 if (!c->cmd_pdu)
1240 return -ENOMEM;
1241 c->req.cmd = &c->cmd_pdu->cmd;
1242
1243 c->rsp_pdu = page_frag_alloc(&queue->pf_cache,
1244 sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1245 if (!c->rsp_pdu)
1246 goto out_free_cmd;
1247 c->req.cqe = &c->rsp_pdu->cqe;
1248
1249 c->data_pdu = page_frag_alloc(&queue->pf_cache,
1250 sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1251 if (!c->data_pdu)
1252 goto out_free_rsp;
1253
1254 c->r2t_pdu = page_frag_alloc(&queue->pf_cache,
1255 sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1256 if (!c->r2t_pdu)
1257 goto out_free_data;
1258
1259 c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
1260
1261 list_add_tail(&c->entry, &queue->free_list);
1262
1263 return 0;
1264out_free_data:
1265 page_frag_free(c->data_pdu);
1266out_free_rsp:
1267 page_frag_free(c->rsp_pdu);
1268out_free_cmd:
1269 page_frag_free(c->cmd_pdu);
1270 return -ENOMEM;
1271}
1272
1273static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c)
1274{
1275 page_frag_free(c->r2t_pdu);
1276 page_frag_free(c->data_pdu);
1277 page_frag_free(c->rsp_pdu);
1278 page_frag_free(c->cmd_pdu);
1279}
1280
1281static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue)
1282{
1283 struct nvmet_tcp_cmd *cmds;
1284 int i, ret = -EINVAL, nr_cmds = queue->nr_cmds;
1285
1286 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL);
1287 if (!cmds)
1288 goto out;
1289
1290 for (i = 0; i < nr_cmds; i++) {
1291 ret = nvmet_tcp_alloc_cmd(queue, cmds + i);
1292 if (ret)
1293 goto out_free;
1294 }
1295
1296 queue->cmds = cmds;
1297
1298 return 0;
1299out_free:
1300 while (--i >= 0)
1301 nvmet_tcp_free_cmd(cmds + i);
1302 kfree(cmds);
1303out:
1304 return ret;
1305}
1306
1307static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue)
1308{
1309 struct nvmet_tcp_cmd *cmds = queue->cmds;
1310 int i;
1311
1312 for (i = 0; i < queue->nr_cmds; i++)
1313 nvmet_tcp_free_cmd(cmds + i);
1314
1315 nvmet_tcp_free_cmd(&queue->connect);
1316 kfree(cmds);
1317}
1318
1319static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue)
1320{
1321 struct socket *sock = queue->sock;
1322
1323 write_lock_bh(&sock->sk->sk_callback_lock);
1324 sock->sk->sk_data_ready = queue->data_ready;
1325 sock->sk->sk_state_change = queue->state_change;
1326 sock->sk->sk_write_space = queue->write_space;
1327 sock->sk->sk_user_data = NULL;
1328 write_unlock_bh(&sock->sk->sk_callback_lock);
1329}
1330
1331static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd)
1332{
1333 nvmet_req_uninit(&cmd->req);
1334 nvmet_tcp_unmap_pdu_iovec(cmd);
1335 kfree(cmd->iov);
1336 sgl_free(cmd->req.sg);
1337}
1338
1339static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
1340{
1341 struct nvmet_tcp_cmd *cmd = queue->cmds;
1342 int i;
1343
1344 for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1345 if (nvmet_tcp_need_data_in(cmd))
1346 nvmet_tcp_finish_cmd(cmd);
1347 }
1348
1349 if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
1350
1351 nvmet_tcp_finish_cmd(&queue->connect);
1352 }
1353}
1354
1355static void nvmet_tcp_release_queue_work(struct work_struct *w)
1356{
1357 struct nvmet_tcp_queue *queue =
1358 container_of(w, struct nvmet_tcp_queue, release_work);
1359
1360 mutex_lock(&nvmet_tcp_queue_mutex);
1361 list_del_init(&queue->queue_list);
1362 mutex_unlock(&nvmet_tcp_queue_mutex);
1363
1364 nvmet_tcp_restore_socket_callbacks(queue);
1365 flush_work(&queue->io_work);
1366
1367 nvmet_tcp_uninit_data_in_cmds(queue);
1368 nvmet_sq_destroy(&queue->nvme_sq);
1369 cancel_work_sync(&queue->io_work);
1370 sock_release(queue->sock);
1371 nvmet_tcp_free_cmds(queue);
1372 if (queue->hdr_digest || queue->data_digest)
1373 nvmet_tcp_free_crypto(queue);
1374 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1375
1376 kfree(queue);
1377}
1378
1379static void nvmet_tcp_data_ready(struct sock *sk)
1380{
1381 struct nvmet_tcp_queue *queue;
1382
1383 read_lock_bh(&sk->sk_callback_lock);
1384 queue = sk->sk_user_data;
1385 if (likely(queue))
1386 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1387 read_unlock_bh(&sk->sk_callback_lock);
1388}
1389
1390static void nvmet_tcp_write_space(struct sock *sk)
1391{
1392 struct nvmet_tcp_queue *queue;
1393
1394 read_lock_bh(&sk->sk_callback_lock);
1395 queue = sk->sk_user_data;
1396 if (unlikely(!queue))
1397 goto out;
1398
1399 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1400 queue->write_space(sk);
1401 goto out;
1402 }
1403
1404 if (sk_stream_is_writeable(sk)) {
1405 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1406 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1407 }
1408out:
1409 read_unlock_bh(&sk->sk_callback_lock);
1410}
1411
1412static void nvmet_tcp_state_change(struct sock *sk)
1413{
1414 struct nvmet_tcp_queue *queue;
1415
1416 write_lock_bh(&sk->sk_callback_lock);
1417 queue = sk->sk_user_data;
1418 if (!queue)
1419 goto done;
1420
1421 switch (sk->sk_state) {
1422 case TCP_FIN_WAIT1:
1423 case TCP_CLOSE_WAIT:
1424 case TCP_CLOSE:
1425
1426 sk->sk_user_data = NULL;
1427 nvmet_tcp_schedule_release_queue(queue);
1428 break;
1429 default:
1430 pr_warn("queue %d unhandled state %d\n",
1431 queue->idx, sk->sk_state);
1432 }
1433done:
1434 write_unlock_bh(&sk->sk_callback_lock);
1435}
1436
1437static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
1438{
1439 struct socket *sock = queue->sock;
1440 struct inet_sock *inet = inet_sk(sock->sk);
1441 int ret;
1442
1443 ret = kernel_getsockname(sock,
1444 (struct sockaddr *)&queue->sockaddr);
1445 if (ret < 0)
1446 return ret;
1447
1448 ret = kernel_getpeername(sock,
1449 (struct sockaddr *)&queue->sockaddr_peer);
1450 if (ret < 0)
1451 return ret;
1452
1453
1454
1455
1456
1457
1458 sock_no_linger(sock->sk);
1459
1460 if (so_priority > 0)
1461 sock_set_priority(sock->sk, so_priority);
1462
1463
1464 if (inet->rcv_tos > 0)
1465 ip_sock_set_tos(sock->sk, inet->rcv_tos);
1466
1467 write_lock_bh(&sock->sk->sk_callback_lock);
1468 sock->sk->sk_user_data = queue;
1469 queue->data_ready = sock->sk->sk_data_ready;
1470 sock->sk->sk_data_ready = nvmet_tcp_data_ready;
1471 queue->state_change = sock->sk->sk_state_change;
1472 sock->sk->sk_state_change = nvmet_tcp_state_change;
1473 queue->write_space = sock->sk->sk_write_space;
1474 sock->sk->sk_write_space = nvmet_tcp_write_space;
1475 write_unlock_bh(&sock->sk->sk_callback_lock);
1476
1477 return 0;
1478}
1479
1480static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port,
1481 struct socket *newsock)
1482{
1483 struct nvmet_tcp_queue *queue;
1484 int ret;
1485
1486 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1487 if (!queue)
1488 return -ENOMEM;
1489
1490 INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work);
1491 INIT_WORK(&queue->io_work, nvmet_tcp_io_work);
1492 queue->sock = newsock;
1493 queue->port = port;
1494 queue->nr_cmds = 0;
1495 spin_lock_init(&queue->state_lock);
1496 queue->state = NVMET_TCP_Q_CONNECTING;
1497 INIT_LIST_HEAD(&queue->free_list);
1498 init_llist_head(&queue->resp_list);
1499 INIT_LIST_HEAD(&queue->resp_send_list);
1500
1501 queue->idx = ida_simple_get(&nvmet_tcp_queue_ida, 0, 0, GFP_KERNEL);
1502 if (queue->idx < 0) {
1503 ret = queue->idx;
1504 goto out_free_queue;
1505 }
1506
1507 ret = nvmet_tcp_alloc_cmd(queue, &queue->connect);
1508 if (ret)
1509 goto out_ida_remove;
1510
1511 ret = nvmet_sq_init(&queue->nvme_sq);
1512 if (ret)
1513 goto out_free_connect;
1514
1515 port->last_cpu = cpumask_next_wrap(port->last_cpu,
1516 cpu_online_mask, -1, false);
1517 queue->cpu = port->last_cpu;
1518 nvmet_prepare_receive_pdu(queue);
1519
1520 mutex_lock(&nvmet_tcp_queue_mutex);
1521 list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list);
1522 mutex_unlock(&nvmet_tcp_queue_mutex);
1523
1524 ret = nvmet_tcp_set_queue_sock(queue);
1525 if (ret)
1526 goto out_destroy_sq;
1527
1528 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1529
1530 return 0;
1531out_destroy_sq:
1532 mutex_lock(&nvmet_tcp_queue_mutex);
1533 list_del_init(&queue->queue_list);
1534 mutex_unlock(&nvmet_tcp_queue_mutex);
1535 nvmet_sq_destroy(&queue->nvme_sq);
1536out_free_connect:
1537 nvmet_tcp_free_cmd(&queue->connect);
1538out_ida_remove:
1539 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1540out_free_queue:
1541 kfree(queue);
1542 return ret;
1543}
1544
1545static void nvmet_tcp_accept_work(struct work_struct *w)
1546{
1547 struct nvmet_tcp_port *port =
1548 container_of(w, struct nvmet_tcp_port, accept_work);
1549 struct socket *newsock;
1550 int ret;
1551
1552 while (true) {
1553 ret = kernel_accept(port->sock, &newsock, O_NONBLOCK);
1554 if (ret < 0) {
1555 if (ret != -EAGAIN)
1556 pr_warn("failed to accept err=%d\n", ret);
1557 return;
1558 }
1559 ret = nvmet_tcp_alloc_queue(port, newsock);
1560 if (ret) {
1561 pr_err("failed to allocate queue\n");
1562 sock_release(newsock);
1563 }
1564 }
1565}
1566
1567static void nvmet_tcp_listen_data_ready(struct sock *sk)
1568{
1569 struct nvmet_tcp_port *port;
1570
1571 read_lock_bh(&sk->sk_callback_lock);
1572 port = sk->sk_user_data;
1573 if (!port)
1574 goto out;
1575
1576 if (sk->sk_state == TCP_LISTEN)
1577 schedule_work(&port->accept_work);
1578out:
1579 read_unlock_bh(&sk->sk_callback_lock);
1580}
1581
1582static int nvmet_tcp_add_port(struct nvmet_port *nport)
1583{
1584 struct nvmet_tcp_port *port;
1585 __kernel_sa_family_t af;
1586 int ret;
1587
1588 port = kzalloc(sizeof(*port), GFP_KERNEL);
1589 if (!port)
1590 return -ENOMEM;
1591
1592 switch (nport->disc_addr.adrfam) {
1593 case NVMF_ADDR_FAMILY_IP4:
1594 af = AF_INET;
1595 break;
1596 case NVMF_ADDR_FAMILY_IP6:
1597 af = AF_INET6;
1598 break;
1599 default:
1600 pr_err("address family %d not supported\n",
1601 nport->disc_addr.adrfam);
1602 ret = -EINVAL;
1603 goto err_port;
1604 }
1605
1606 ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1607 nport->disc_addr.trsvcid, &port->addr);
1608 if (ret) {
1609 pr_err("malformed ip/port passed: %s:%s\n",
1610 nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1611 goto err_port;
1612 }
1613
1614 port->nport = nport;
1615 port->last_cpu = -1;
1616 INIT_WORK(&port->accept_work, nvmet_tcp_accept_work);
1617 if (port->nport->inline_data_size < 0)
1618 port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE;
1619
1620 ret = sock_create(port->addr.ss_family, SOCK_STREAM,
1621 IPPROTO_TCP, &port->sock);
1622 if (ret) {
1623 pr_err("failed to create a socket\n");
1624 goto err_port;
1625 }
1626
1627 port->sock->sk->sk_user_data = port;
1628 port->data_ready = port->sock->sk->sk_data_ready;
1629 port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready;
1630 sock_set_reuseaddr(port->sock->sk);
1631 tcp_sock_set_nodelay(port->sock->sk);
1632 if (so_priority > 0)
1633 sock_set_priority(port->sock->sk, so_priority);
1634
1635 ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
1636 sizeof(port->addr));
1637 if (ret) {
1638 pr_err("failed to bind port socket %d\n", ret);
1639 goto err_sock;
1640 }
1641
1642 ret = kernel_listen(port->sock, 128);
1643 if (ret) {
1644 pr_err("failed to listen %d on port sock\n", ret);
1645 goto err_sock;
1646 }
1647
1648 nport->priv = port;
1649 pr_info("enabling port %d (%pISpc)\n",
1650 le16_to_cpu(nport->disc_addr.portid), &port->addr);
1651
1652 return 0;
1653
1654err_sock:
1655 sock_release(port->sock);
1656err_port:
1657 kfree(port);
1658 return ret;
1659}
1660
1661static void nvmet_tcp_remove_port(struct nvmet_port *nport)
1662{
1663 struct nvmet_tcp_port *port = nport->priv;
1664
1665 write_lock_bh(&port->sock->sk->sk_callback_lock);
1666 port->sock->sk->sk_data_ready = port->data_ready;
1667 port->sock->sk->sk_user_data = NULL;
1668 write_unlock_bh(&port->sock->sk->sk_callback_lock);
1669 cancel_work_sync(&port->accept_work);
1670
1671 sock_release(port->sock);
1672 kfree(port);
1673}
1674
1675static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl)
1676{
1677 struct nvmet_tcp_queue *queue;
1678
1679 mutex_lock(&nvmet_tcp_queue_mutex);
1680 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1681 if (queue->nvme_sq.ctrl == ctrl)
1682 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1683 mutex_unlock(&nvmet_tcp_queue_mutex);
1684}
1685
1686static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
1687{
1688 struct nvmet_tcp_queue *queue =
1689 container_of(sq, struct nvmet_tcp_queue, nvme_sq);
1690
1691 if (sq->qid == 0) {
1692
1693 flush_scheduled_work();
1694 }
1695
1696 queue->nr_cmds = sq->size * 2;
1697 if (nvmet_tcp_alloc_cmds(queue))
1698 return NVME_SC_INTERNAL;
1699 return 0;
1700}
1701
1702static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
1703 struct nvmet_port *nport, char *traddr)
1704{
1705 struct nvmet_tcp_port *port = nport->priv;
1706
1707 if (inet_addr_is_any((struct sockaddr *)&port->addr)) {
1708 struct nvmet_tcp_cmd *cmd =
1709 container_of(req, struct nvmet_tcp_cmd, req);
1710 struct nvmet_tcp_queue *queue = cmd->queue;
1711
1712 sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr);
1713 } else {
1714 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1715 }
1716}
1717
1718static const struct nvmet_fabrics_ops nvmet_tcp_ops = {
1719 .owner = THIS_MODULE,
1720 .type = NVMF_TRTYPE_TCP,
1721 .msdbd = 1,
1722 .add_port = nvmet_tcp_add_port,
1723 .remove_port = nvmet_tcp_remove_port,
1724 .queue_response = nvmet_tcp_queue_response,
1725 .delete_ctrl = nvmet_tcp_delete_ctrl,
1726 .install_queue = nvmet_tcp_install_queue,
1727 .disc_traddr = nvmet_tcp_disc_port_addr,
1728};
1729
1730static int __init nvmet_tcp_init(void)
1731{
1732 int ret;
1733
1734 nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0);
1735 if (!nvmet_tcp_wq)
1736 return -ENOMEM;
1737
1738 ret = nvmet_register_transport(&nvmet_tcp_ops);
1739 if (ret)
1740 goto err;
1741
1742 return 0;
1743err:
1744 destroy_workqueue(nvmet_tcp_wq);
1745 return ret;
1746}
1747
1748static void __exit nvmet_tcp_exit(void)
1749{
1750 struct nvmet_tcp_queue *queue;
1751
1752 nvmet_unregister_transport(&nvmet_tcp_ops);
1753
1754 flush_scheduled_work();
1755 mutex_lock(&nvmet_tcp_queue_mutex);
1756 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1757 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1758 mutex_unlock(&nvmet_tcp_queue_mutex);
1759 flush_scheduled_work();
1760
1761 destroy_workqueue(nvmet_tcp_wq);
1762}
1763
1764module_init(nvmet_tcp_init);
1765module_exit(nvmet_tcp_exit);
1766
1767MODULE_LICENSE("GPL v2");
1768MODULE_ALIAS("nvmet-transport-3");
1769
